Mercurial > hg > truffle
view src/share/vm/memory/genRemSet.cpp @ 18719:6484e5c068c7
Generalize object reading in HotSpotMemoryAccessProvider.
author | Roland Schatz <roland.schatz@oracle.com> |
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date | Thu, 18 Dec 2014 15:31:12 +0100 |
parents | 89152779163c |
children |
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/* * Copyright (c) 2001, 2013, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "classfile/classLoaderData.hpp" #include "memory/cardTableRS.hpp" #include "memory/genRemSet.hpp" // This kind of "BarrierSet" allows a "CollectedHeap" to detect and // enumerate ref fields that have been modified (since the last // enumeration.) uintx GenRemSet::max_alignment_constraint(Name nm) { assert(nm == GenRemSet::CardTable, "Unrecognized GenRemSet type."); return CardTableRS::ct_max_alignment_constraint(); } class HasAccumulatedModifiedOopsClosure : public KlassClosure { bool _found; public: HasAccumulatedModifiedOopsClosure() : _found(false) {} void do_klass(Klass* klass) { if (_found) { return; } if (klass->has_accumulated_modified_oops()) { _found = true; } } bool found() { return _found; } }; bool KlassRemSet::mod_union_is_clear() { HasAccumulatedModifiedOopsClosure closure; ClassLoaderDataGraph::classes_do(&closure); return !closure.found(); } class ClearKlassModUnionClosure : public KlassClosure { public: void do_klass(Klass* klass) { if (klass->has_accumulated_modified_oops()) { klass->clear_accumulated_modified_oops(); } } }; void KlassRemSet::clear_mod_union() { ClearKlassModUnionClosure closure; ClassLoaderDataGraph::classes_do(&closure); }